Wiktionary
puffs up
vb. (en-third-person singularpuff up)
Usage examples of "puffs up".
You blow it and it puffs up and unrolls and makes a noise like a fart, you know?
It puffs up against your lungs so that your breathing becomes short.
The brain puffs up with fluid -- in the way any injured tissue does -- and it crushes itself.
Margaery, you're clever, be a dear and tell your poor old half-daft grandmother the name of that queer fish from the Summer Isles that puffs up to ten times its own size when you poke it.
But if you will not accompany me, Eldest Uncle, then you must not complain if Cat Mask's views are accepted by the others simply because he talks the loudest and puffs up his manly chest.